Converting PC Games to Nintendo DS: Not Possible

No conversion tool exists. Fundamental mismatches:

• CPU: x86/ARM64 (PC) vs. ARM9 + ARM7 (DS) — different ISAs.
• GPU: Programmable shaders vs. fixed-function 2D/3D engine (no shaders).
• RAM: GBs vs. 4 MB (main) + 656 KB (VRAM).
• Storage: GBs vs. 8–512 MB cartridge.
• Input: KB/M/gamepad vs. D-pad + touch + mic.

What You Can Do

• DS emulation on PC — melonDS, DeSmuME, NO$GBA (upscale, save states, cheats).
• Homebrew DS dev — devkitPro (C/C++), libnds. Steep curve.
• Port from scratch — Rewrite logic for DS limits (e.g., Quake DS, Doom DS).

If you want to play PC games portably: Steam Deck / ROG Ally / Legion Go.